Im just getting into event photography such as weddings, birthday parties etc... I currently own
Canon 5D Mark III
Tokina 11-16mm (Works at 16mm on FF)
Canon 50mm 1.4
Canon 24-70mm 2.8L II
Canon 70-200mm 2.8L IS II
Im also looking to purchase the Canon 100mm 2.8L Macro (for ring, cake type shots) What I'm interested in knowing is how can incorporate both camera bodies with those lenses and still be functional and not have to change lens back and forth? I was thinking of just keeping the 70-200mm on the 5D and using the 24-70mm on the 7D. But that leaves me with the issue of overlapping focal lengths and also wont have anything at the wider focal length for group shot.
Anyones familiar with event shooting that can help me figure this out would be great.
I would suggest either changing to both FF bodies, OR, put the 24-70 on the FF for wide to mid range shots, then the 70-200 on the crop.
Generally you will know in advance when you will need to use UWA like 16mm, so you can change your FF for that, and keep Tele on crop to take head/shoulder shots of anyone in the group. Having that gap between 70mm (24-70 on FF) and 112mm FOV (70-200 on crop) trades off to your effective FOV on the crop body going to a whopping 320mm though - to me, it makes sense in a lot of situations because the gain outweighs the 42mm or so loss in the middle, provided you don't need to pump the ISO on the 5D3 really high due to low light.
Honestly though, I think the decision is going to be made each and every time you show up at a venue. Because they're all going to be different and have different room sizes, etc.
Also bear in mind you can crop into a 5D3 image more than you can into a 7D image. There are simply more MP. I've seen several discussions about that here, which all ended up at the same place: cropping into a 5D3 image typically nets better images when comparing equivalent FOV taking cropping into account, particularly at higher ISO. I tend to use it when that crop is to my advantage - e.g. putting my 100mm macro L on my backup 60D body for food/drink/placecard/menu and other closeup shots. I can stand a few feet away out of people's hair and still get a great snug shot without crowding anyone at the event. To me, the primary advantage to switching to 70-200 on 5D3 would be if you were shooting indoors and needed the high ISO capabilities to catch candids or other shots from a dozen or more feet away.
So sorry if I sound like I'm being ambiguous, but I don't think there will be a fixed setup. You're going to have to decide how to deploy your equipment every time, based on the conditions. From that perspective, if you want to simplify, do a 6D for one, and 5D3 for the other. Or two 5D3s if you can spring for them.